Efficient removal of diethyl dithiocarbamate with EDTA functionalized electrolytic manganese residue and mechanism exploration

Mengke Li; Liang Hu; Hui Zhong; Zhiguo He; Wei Sun; Daolin Xiong

doi:10.1016/j.jhazmat.2020.124582

Efficient removal of diethyl dithiocarbamate with EDTA functionalized electrolytic manganese residue and mechanism exploration

J Hazard Mater. 2021 May 15:410:124582. doi: 10.1016/j.jhazmat.2020.124582. Epub 2020 Nov 19.

Authors

Mengke Li¹, Liang Hu¹, Hui Zhong², Zhiguo He³, Wei Sun¹, Daolin Xiong⁴

Affiliations

¹ School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
² School of Life Science, Central South University, Changsha 410012, China. Electronic address: hmmzhjj@csu.edu.cn.
³ School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Faculty of Materials Metallurgy & Chemistry, Jiangxi University of Science & Technology, Ganzhou, Jiangxi 341000, China. Electronic address: zghe@csu.edu.cn.
⁴ Faculty of Materials Metallurgy & Chemistry, Jiangxi University of Science & Technology, Ganzhou, Jiangxi 341000, China.

PMID: 33257127
DOI: 10.1016/j.jhazmat.2020.124582

Abstract

The recycling of solid wastes is obligable as it can reduce the environmental pollution and prevent the diffusion of secondary pollution. In this study, a novel cheap adsorbent was prepared by modifying electrolytic manganese residue (EMR) with EDTA. The maximum adsorption capacity of adsorbents for diethyl dithiocarbamate (DDTC) was 133.46 mg/g under initial pH of 7.32 at room temperature. Adsorption kinetics study revealed the DDTC adsorption on EDTA-EMR is mainly controlled by chemisorption and isotherm studies implied the adsorption is a monolayer process. Mechanism exploration found that the DDTC molecules could enter into the holes of EDTA-EMR, and the transition metal-based sorption sites were crucial for the target molecule immobilization and chelation. High pH value (> 10) was found to have inhibited the adsorption capacity of adsorbent, which should be due to the fact that the decreasing of functional groups on adsorbents surface and the competition between DDTC and OH^-. The ionic strength has negligible effect on the adsorption and the as-synthesized adsorbents showed excellent performance after five cycles. The overall results reveal that EDTA-EMR is a promising adsorbent ascribed by its low cost, good recyclability and excellent adsorption capacity.

Keywords: Adsorption; Diethyl dithiocarbamate; Electrolytic manganese residue; Mineral processing wastewater; Recycling.

Publication types

Research Support, Non-U.S. Gov't